Supplement HTML with PDF where applicable

I prefer to download PDFs for offline reading. My motivation is as much because I prefer Apple Preview to web browsers as for flexibility when traveling. Could you expose self-hosted links for alternate PDF (especially source) content?

This is a nice suggestion. We're hoping to include the Scala Language Specification in both HTML and PDF at some point- if it turns out that it's straightforward to generate PDFs from our other source files, we'll look into generating PDFs for other important articles as well.

Alternatively, we've yet to provide a nice printer-friendly view of the articles as well, which we could set up to output as nice PDFs.

This would be helpful to me as well. Things in the "Guides and Overview" section seem like ideal candidates for PDFification. I wanted to download the Introduction to Collections doc to read on my Kindle, but could not. Even providing a "Everything on one Page" would be hugely helpful, because then I could save it in Instapaper, or print it to PDF myself.